Furnace wall



R. A. FORESMAN FURNACE WALL Filed May 18. 1926 March 20, 1928.

2 Sheets-Sheet '1 R.A.Foresman INVENTOR ATTORNEY March 20, 1928.

R. A. FORESMAN 6 FURNACE WALL Filed May 18, 1925 2 Sheets-Sheet 2 WITNESSES:

Rfiforesman INVENTOR ATTORNEY Patented Mar. 20, 1928.

UNITED STATES PATENT OFFICE.

ROBERT A. FOBESMAN, OF MOORE, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

FURNACE WALL.

Application filed ma 18,

My invention relates to high temperature furnaces, more particularly to boiler furnaces, and has for an object to provide apparatus of the character designated with awall which shall be so constructed as to withstand high furnace temperatures without rapid deterioration.

A more specific object of my invention is to provide a water cooled furnace wall embodying interchangeable wall elementswhich may be quickly installed and readily replaced.

A still further object of myinventwn is to provide a furnace wall capable of withstanding high furnace temperatures and which, in association with an outer wall, effectively prevents excessive radiation of heat from the furnace to the boiler room.

Apparatus embodying features of my in- Vention is illustrated in the accompanying drawings, forming a part of this application, in which:

Fig. 1 is a fragmentary sectional view of a furnace wall made in accordance with my invention and taken along the line I-I of Fig. 2; i Fig. 2 is a view in elevation of the structure shown in Fig. 1 and viewed from the outside of the furnace;

Fig. 3 is a horizontal sectional view taken along the line III-III of Fig. 2;

. Fig. 4 is a View showing the removal of a wall element similar to that illustrated in Fig. 3 from the outside of the furnace;

Fig. 5 is a horizontal sectional view taken along the line V-V of Fig. 2;

Fig. 6 is a view in elevation of the structure shown in Fig. 5 when seen from the inside of the furnace;

0 And Fig. 7 is a sectional plan view showing a preferred method of installing my improved furnace wall in association with an outer wall, to prevent excessive heat radiation from the furnace.

In my application, Serial No. 718,942, filed December 23, 1924, and my application, Serial No. 32,111, filed May 22, 1925, both assigned to. the Westinghouse Electric and Manufacturing Company, there is disclosed a furnace wall of the general character covered by this application. The improvement herein disclosed consists in providing Wall elements which may be readily installed and replaced, which permit of relative expansion and contraction between the wall ele- 1926. Serial No. 109,998.

ments and their associated parts, and which permit of the greatest possible transfer of heat between the furnace and the Water cooled tubes of the wall.

Briefly, the invention consists in a furnace wall comprising a plurality of spaced, aligned tubes together with wall elements each having a hook-like part extending part way around an associated tube for supporting the element in its relation to the tubes, together with means for joining the elements together to prevent an undesired disengagement from the tubes, said joining means providing ready assembly and disassembly under all conditions of service.

The. wall elements, in general, take two distinct forms, one of which is particularly adapted for association with the furnace wall where it comes in contact with the fuel bed and the other of which is particularly adapted'for application above the line of the fuel bed. The assembled wall may be associated with an outer wall so situated as to provide a dead air space between the two and thus provide an effective insulation between the furnace and the boiler room.

Referring now to the drawings for a better understanding of my invention, I show in Figs. 1 and 2 a furnace wall embodying a plurality of spaced, aligned tubes 1010 The tubes 16-10 may have water circulating therein, and, for that purpose, are shown as being connected to a suitable header 11. At 12 is shown a fragmentary portion of the fuel bed which comes in contact with the lower portion of the furnace wall. It is to be understood that the furnace wall, as illustrated, may be any one of the boundary walls of a boiler furnace.

Cooperating with the spaced, aligned tubes 101O are my improved wall elements 13-13 and 14-14. The wall elements 1ll are adapted to beinstalled, as will more clearly appear hereinafter, where the wall is in contact with the fuel bed, while the ele ments 1313 are applied above the fuel bed of the furnace.

Referring now particularly to Figs. 2, 3 and 4:, each of the wall elements 1 l-14 comprises a fiat panel portion 16 and a hooklike portion 17, said hook-like portion 17 conforming in inner contour to the outer contour of the tubes 1010. The panel portion 16 of each of these elements is adapted to form, in cooperation with a similar element, a substantially continuous fiat wall. The hook-like portion 17 extends practically the entire length of the element and extends substantially half way round its associated tube 10. The hook-like portion 17 of an adjacent cooperating wall element 14 also extends substantially half way round the tube so that the tube is almost completely embraced by two associated wall elements. The construction just described prevents abrasion of the tubes 10-10 and their conse uent wearing away by action of the fuel ad acent thereto should it be desired to apply the wall elements 14-14 with the booklike portions 1717 towards the inside'of the furnace. In order to hold the elements 14-14 in place, I provide, in each end of each of the portions 17 of the elements, a slot 18 adapted to receive a key member 19, so that when the elements 14-'14 are assembled in place with their associated tubes 1010, and the keys 19-19 inserted, the whole forms a unitary structure. In order to prevent leakage between the wall elements I may provide grooves 2l21 in the edges of the elements in' which suitable packing 22 may be inserted.

In applying the elements 14'14 they may be disposed so that either the flat portions 16-16 are on the outside of the furnace or on the inside thereof. Itmore often is the case that the structure surrounding the lower part of'a furnace may prevent the application of the elements adjacent thereto from the exterior of the furnace and I accordingly show them in Fig. 1 with the fiat portions 1616 on the inside of the wall. This method of application further affords greater protection to the tubes rom the abrasive eflects of the fuel bed. This particular form of wall element may be removed from either side of the furnace .wall. I

It will be apparent that, with the keys 19-19 removed, an element may be readily removed from an associated tube by pulling it outwardly therefrom toward the panel portion 16. It may also be removed from the opposite side of the furnace, as shown in Fig. 4, by sliding upwardly or downwardly an associated element 14 and pulling it.

between the tubes toward the hook-like portion 17.

With the form of wall element just described, where the structure expands and contracts due to temperature changes in the furnace, the clearance between the elements allows for such expansion and contraction while the packings 2222 prevent leakage into or out of the furnace.

Referring now particularly to Figs; 1, 5 and 6, the wall elements 131 3 each comprise a Hat panel portion 20 and a pair of ook-portions 25 and 23. The hook portions 25 and 23' conform in inner contour to the tubes 10-10 and extend part way round an associated tube 10 a sufficient distance to insure a unitary structure of the wall when assembled.

Formed on the flat surface 20 of each of the elements 13 adjacent one side thereof is a lug 24 which is adapted to cooperate with allows the members 13-13 to yield upon expansion or contraction of said elements or of the tubes 101(), or both. The U-shaped member 24 performs yet another function in holding .the wall elements 13-13 tightly against the tubes 10-10, hearing as it does,

against the two lugs 24-24, the coactin'g edges of the elements 13-13 act as a fulcrum, thereby permitting the U-shaped mem-' ber 24 to pull the hook portions tightly inward of the row of tubes 10-10 and hold the wall elements 13-13 firmly in-place.

With this form of construction, there is also provided grooves 21-21 along the edges of adjacent elements, whereby a suitable packing 22' may be inserted to prevent leakage in or out of the furnace.

Should it be desired to removev any one of the elements 1313 while the furnace is in service, it is only necessary to remove the U-shaped member 26, whereupon either of the adjacent members 13-13, normall held in place thereby, may be pulled out 0 place in the direction of the flat surface 20, or from the interior of the furnace.

Should it be desired to remove one of the members 14, which is located below a member 13, the U-shaped member 26 and the member 13 above the member 14 is removed, whereupon the key 19, holding the members 1414 in place, may be removed and the member 14 removed from the furnace wall aFs previously described in connection with With the form of wall elements 1313, it I cause of the necessity of' frequent renewal I of a purely refractory furnace wall such as is common y known.

Referring now to Fig. 7, I show a furnace wall 30 made up of units such as described with reference to the previous figures of the drawings. It will be apparent that, with such a wall, some arrangement should be der to hold the sections in place, I provide, a

suitable number of T beams 32-32 and bolt the sections 3131 thereto as by bolts 3333. The outer wall is spaced from the inner wall 30a sufficient distance to provide a dead air space of substantial width thus providin a Considerable degree of heat insulation. he outer wall, with its sheets 3l31 of heat-- insulating material, further impedes the radiation of heat, and the combined structure thus provides an ideal furnace wall installation.

From the foregoing, it will be apparent that I have devised an improved water-cooled furnace wall embodying wall elements easily installed and replaced, together with an improved furnace wall installation capable of preventing undue heat radiation exteriorly of the furnace.

While I have shown my invention in several forms it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitationsshall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

,1. In a furnace wall, a pairof spaced tubes, a pair of elements forming-a closed wall on one side of the tubes, means carried by each of the elements .and extending part way around a cooperating tube for supporting said element and arranged to permit the ready removal of said element-from the wall and resilient means permitting. relative expansion between the elements for connecting the elements together.

2. A furnace wall comprising a series of spaced tubes for the circulation of a coolin medium, individual wall elements arranged along one side of the tubes, supporting means carried by each of the wall elements and extending part way around the cooperating tubes, and resilient retaining means joining the wall elements together and permitting relative movement upon expansion and contraction.

3. In a furnace, a series of aligned and spaced water circulating tube members.

along a boundary of the furnace, a plurality of cooperating pairs of wall elements disposed along the side of the tube members remote from the furnace and cooperating therewith to form a section of a furnace wall, hook-like members carried by the wall elements and extending in engaging relation part way around the. cooperating tube members and permitting insertion or removal of the individual wall elements from the outer side of said furnace wall, cooperating juxtaposed lugs formed on each pair of wall elements on the outer side of the furnace wall, and a resilient U-shaped member joining the lugs together.

4. In a furnace, a pair of spaced tube members, a pair of wall elements disposed on one side of the tube members and cooperating with said tube members to form a furnace wall, a hook-like member carried by each of the wall members and extending inwardly of the furnace and part way around a cooperating tube, in s formed on the wall members exteriorly o the furnace, and resilient means for joining the lugs together.

5. In a furnace, a pair of spaced tube members, a pair of wall elements disposed on one side of the tube members and cooperating with said tube members to form a furnace wall, a hook-like member carried by each of the wall elements and extending part way around a cooperating tube, a lug' formed on each of the wall elements on the side thereof most remote from the furnace, and means joining tlfe lugs together to form a unitary structure.

6. In a furnace, a pair of spaced tube members, a pair of wall elements disposed on one side of the tube members and cooperating with said tube members to form a furnace wall, a hook-like member carried by each of the wall elements and extending inwardly of the furnace part way around a cooperating tube, a lug formed on each of the wall elements on the side thereof most remote from the furnace, and resilient means permitting relative expansion and contraction between the wall elements for joining the lugs together and forming a unitary structure.

7. In a furnace, a series of aligned and spaced tube members, series of pairs of wall elements disposed along one side of the tube members and cooperating therewith to form a section of a furnace wall, a hook-like member formed on each of. the wall elements and extending inwardly of the furnace in engag ing relation part way around acooperating tube member, lugs formed on the wall elements on the side thereof most remote fromv 

